Steel square can be made of steel of various grades:
carbon - St3, St20, St35; St45
low alloyed - Steel 40X, Steel 40XH;
high-alloyed - 08Ð¥18Ð10; 40XH2MA; 38XH3MA; 14Ð¥17Ð2 and others high-speed - U7; U7A; U8A
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